This paper explores how urbanization, through its role in the evolution of Urban Heat Island (UHI), affects residential water consumption. Using longitudinal data and drawing on a mesoscale atmospheric model, we examine how variations in surface temperature at the census tract level have affected water use in single family residences in Phoenix, Arizona. Results show that each Fahrenheit rise in nighttime temperature increases water consumption by 1.4%. This temperature effect is found to vary significantly with lot size and pool size. The study provides insights into the links between urban form and water use, through the dynamics of UHI.
Creating a Healthier, More Livable and Prosperous Phoenix
Phoenix is poised to become the next great American City. The Tree and Shade Master Plan presents Phoenix’s leaders and residents a roadmap to creating a 21st Century desert city. The urban forest is a keystone to creating a sustainable city because it solves many problems with one single solution. By investing in trees and the urban forest, the city can reduce its carbon footprint, decrease energy costs, reduce storm water runoff, increase biodiversity, address the urban heat island effect, clean the air, and increase property values. In addition, trees can help to create walkable streets and vibrant pedestrian places. More trees will not solve all the problems, but it is known that for every dollar invested in the urban forest results in an impressive return of $2.23 in benefits.
Phoenix has a strong foundation on which to build the future. Phoenix residents value natural resources and have voted repeatedly to invest in the living infrastructure. For instance, the Phoenix Parks and Preserve Initiative was passed twice with over 75 percent voter approval. This modest sales tax has purchased land for the Sonoran Preserve, funded habitat restoration efforts along Rio Salado, built new parks and planted hundreds of new trees. These projects and others like it provide the base for a healthy urban forest. Trees and engineered shade have the potential to be one of the city’s greatest assets and the Tree and Shade Master Plan provides the framework for creating a healthier, more livable and prosperous Phoenix.
The Urban Forest – Trees for People
The urban forest is a critical component of the living infrastructure. It benefits and attracts residents and tourists alike to live, work, shop and play in the city. Phoenix’s urban forest is a diverse ecosystem of soils, vegetation, trees, associated organisms, air, water, wildlife and people. The urban forest is found not only in parks, mountain preserves and native desert areas, but also in neighborhoods, commercial corridors, industrial parks and along streets. The urban forest is made up of a rich mosaic of private and public property that surrounds the city and provides many environmental, economic, and social benefits.
In order for the urban forest to be a profitable investment, Phoenix must do more than just plant trees. The entire lifecycle of the tree must be addressed because the current planting, maintenance, and irrigation practices are preventing many trees from providing their maximum return on investment. The Tree and Shade Master Plan provides a detailed roadmap to address these issues, as well as many others, with realistic and incremental steps. To succeed, this plan requires a long-term investment from the residents and leaders of Phoenix.
Trees are Solution Multipliers
Solution multipliers solve numerous problems simultaneously. Trees are a perfect example of a solution multiplier because when planted and maintained correctly, they can provide many economic, environmental, and social benefits. According to the US Forest Service, trees benefit the community by: providing a cooling effect that reduces energy costs; improving air quality; strengthening quality of place and the local economy; reducing storm water runoff; improving social connections; promoting smart growth and compact development; and creating walkable communities (US Forest Service and Urban & Community Forestry). Trees are high-yield assets; for example, the City of Chicago values its trees at $2.3 billion dollars. Trees have a documented return on investment (ROI) in Arizona of $2.23 for every $1 invested (US Department of Agriculture Forest Service). This demonstrates the important role that trees have within the city's economy. This is why it is critical to manage and invest in the urban forest; the health of the urban forest is closely linked to the economic health of the city.
Maintainable Infrastructure
Phoenix is a desert city that has a history of several decades of drought. In order to achieve a healthy urban forest we must use water wisely. Currently, 60 percent of Phoenix’s water is used outdoors, mainly for landscape irrigation. According to the City of Phoenix’s Water Services Department, Phoenix has an adequate sustainable water supply to meet the State of Arizona’s 100-year assured water supply standard. This includes growth in Phoenix’s system water demand over the next 20 years or more. Nonetheless, to achieve a maintainable urban forest, water must be used more efficiently. This is done with high-efficiency irrigation systems, use of drought-tolerant plant material, strategic placement of shade corridors and continued education. In order for a healthy urban forest to exist, it must be coupled with strong water management.
Implementation
The Urban Forest Infrastructure Team and the Parks and Recreation Department are charged with coordinating and maintaining the Tree and Shade Master Plan. Many City departments will implement the plan as they work to fulfill their own missions. The Tree and Shade Master Plan will not only provide a framework to achieve an average 25 percent tree canopy coverage by 2030 but will also help to achieve many goals and policies from the Green Phoenix Initiative and the voter ratified General Plan.
The plan proposes incremental steps to achieve the 2030 vision and canopy goal. The City of Phoenix is beginning to put a process in place to preserve, maintain, and redevelop the urban forest. This plan intends to increase the quality of life and economic vitality of the city by recommending ways to create a sustainable urban forest for future generations.
The City of Phoenix Street Transportation Department partnered with the Rob and Melani Walton Sustainability Solutions Service at Arizona State University (ASU) and researchers from various ASU schools to evaluate the effectiveness, performance, and community perception of the new pavement coating. The data collection and analysis occurred across multiple neighborhoods and at varying times across days and/or months over the course of one year (July 15, 2020–July 14, 2021), allowing the team to study the impacts of the surface treatment under various weather conditions.
Intermediating between farmers and development projects, farmers’ organizations (FOs) have the potential to improve rural market access and promote equitable growth by reducing transaction costs, strengthening producer bargaining power, and enabling collective action. Capacity building of FOs is a cornerstone of rural development policies and programs, such as the United Nations World Food Programme’s Purchase for Progress (P4P) project, which partnered with 830 FOs representing 1.7 million farmers from 2008 through 2014.
Despite significant donor investment, a unifying framework defining the concept and measurement of capacity building has eluded development practitioners. The core challenge originates from the paradigm shift away from top-down development toward participatory capacity building. Motivated by the practical difficulties encountered in ceding control to beneficiaries to enable their empowerment and self-determination, this study seeks to clarify conceptualizations of FO capacity and FO capacity building, to refine monitoring and evaluation of capacity building initiatives, and to develop and validate indicators and indices of organizational maturity and capacity.
Drawing on a critical review of the capacity building literature, this study develops an integrated, multi-level, capacity building framework and elaborates different levels of FO participation at each stage of the capacity building process. Through this lens, the research analyzes 11 organizational capacity assessment (OCA) tools and methodologies, and constructs 33 indicators of functional organizational capital to address OCA content gaps in conflict resolution, member participation, adaptive capacity, and the drivers of organizational change and collective action. The research further proposes methodological changes for increasing member participation in OCA to reduce reporting bias, to build knowledge and planning capacities, and to engender empowerment.
The indicators developed are tested on primary data gathered from P4P (treatment) and non-P4P (control) FOs in Ghana and Malawi. Results show that P4P has positively impacted the organizational capacity of participating groups, although there are regional differences. The statistical analysis validates most of the indicators and indices developed from this study’s participatory capacity building framework. Overall, this research contributes to the understanding of what FO capacity building means and how to measure it.
Self-governance From Above: Principles of Polycentric Governance in Large-Scale Water Infrastructure
I use the case of large-scale water infrastructure in Arizona to explore a novel approach to measurement of polycentric decision making contexts. Through semi-structured interviews with water operators in the Arizona water system, this research explores how qualitative and quantitative comparisons can be made between polycentric governance constructs as they are understood by institutional scholars, experienced by actors in polycentric systems, and represented in public policy discourses. I introduce several measures of conditions of polycentricity at a subjective level, including the extents to which actors: experience variety in the work assigned to them; define strong operational priorities; perceive their priorities to be shared by others; identify discrete, critical decisions in the course of their work responsibilities; recall information and action dependencies in their decision making processes; relate communicating their decisions to other dependent decision makers; describe constraints in their process; and evaluate their own independence to make decisions. I use configurational analysis and narrative analysis to show how decision making and governance are understood by operators within the Arizona water system. These results contribute to practical approaches for diagnosis of polycentric systems and theory-building in self governance.